CVE-2026-40686

CVE-2026-40686 affects Exim before 4.99.2 when utf8 operators are enabled. The vulnerability is an out-of-bounds read triggered by large UTF-8 trailing characters in malformed UTF-8 header data, with the potential for information disclosure via an error message produced during handling of an unre...

CVE-2026-40686

In Exim before 4.99.2, when utf8 operators are enabled, there is an out-of-bounds read if large UTF-8 trailing characters are present malformed UTF-8 header data. Information might be divulged within an error message produced during handling of an unrelated e-mail message...